• BOOST air to the rooms you need it
  • BLOCK air in unoccupied rooms
  • SAVE MONEY- heat and cool only the rooms you use
  • NO AIR GAPS- The only cover that conforms to the vent damper creating a COMPLETE SEAL
  • For STEEL Vent faces sized 5.5” to 5.75” wide & 11.5” to 12” long. Please measure before ordering
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